Pneumatic dental plugger



` (No Model.)

J H HBIVLY PNEUMATIC'DBNTAL PLUGGER.

No. 499,632. Patented June 13, 1-893.

-. .y ggf UNITED STATES PATENT OFFICE..

JOHN H. HEIVLY, OF OIL CITY, PENNSYLVANIA.

PN Eu MATIC DENTAL PLUGGER.

SPECIFICATION forming part of Letters Patent No. 499,632, dated J' une13, 1893.

Application filed October 3, 1892. Serial No. 447,629. (No model.)

To all whom it may concern:

Beit known that I, JOHN H. HEIVLY, a citizen of the United States,residing at Oil City, in the county of Venango and State of Penn-Sylvania, have invented certain new and useful Improvements in PneumaticDental Pluggers, of which the following is a full, clear, and exactdescription.

My invention relates to that class of dental pluggers which are operatedby the alternate compression and expansion of air; and my inventionconsists in features of novelty to be hereinafter described and thenpartielllarly pointed out in the claims.

In order that my invention may be fully understood, Iwill now proceed todescribe the same with reference to the accompanying drawings, in which-Figure 1 is a perspective view of a dental engine carrying myimprovedair-pump, with my improved plugger connected thereto by the usualiiexible tubing. Fig. 2 is a longitudinal sectional view of the pluggerextending partly through the tubing. Fig. 8 is a view of the air pumpand its attached parts partly in elevation and partly in section. Fig. 4is a perspective View of the valve closing ring.

Referring to the drawings 1 represents a dental engine of ordinaryconstruction having a standard 2. Secured to the standard 2 by means ofa rectangularly bent fixed piece o and rectangularly bent piece orclamping plate-land screws 5 passing through said pieces isacastinghavingahorizontal arm 7 to which is secured the cylinder 8 of the airpump. Above said cylinder and journaledin tubular bearing piece 9 at theupper end of the casting is shaft 10 on which is fixed the peripherallygrooved wheel 11 connected by belt 12 to the driving wheel 13 of theengine. The wheel 11 is provided with a series of screw threadedperforations 14, which are arranged eccentrically around the axis of thewheel, so that should the stroke of piston 15 be desired to belengthened or shortened,it is only necessary to remove the attachingscrew 16 of the connecting rod 17 from the perforation in which itisscrewed and Screw it into the required perforation.

Fixed iu acentral perforation 18-in the piston is a centrallyscrew-threaded cylindrical piece 19, screw 2O passing through theperforation in the piston from its opposite side and screwing into saidcylindrical piece, between which screw 20 and the piston is placed awasher 21. A slitted extension 22 of the cylindrical piece 19 hasriveted within it a flat spring metal plate 23 to which is riveted inturn the slitted end of the connecting rod 17. By using this metallicspring I am enabled to place the connection so as to bring the rodsactin to the center of the piston.

Welded within perforations 24 in the base of the cylinder of the airpump is a short tube 25 which passes through a perforation 26 in thehorizontal arm 7 of casting 6, onto which may be placed one end offlexible tubing 27, through which latter the pneumatic action of theair-pump is communicated to the dental plugger 28.

The plugger proper is constructed as followsz-29 is a hollow cylindricalhandle in which isetted at one end a perforated plug 30 which has ashort internally shouldered tube 31 extending therefrom. Onto this tubeis placed the other end of flexible tube 27. Bearing against shoulder 32of tube 31 is a spiral spring 33 which is long enough to occupy aportion of tubing 27. The occupancy of said tubing by said spring willprevent any abrupt bend in the former whereby the air passage might beclosed and thus render the device inoperative. The other end ofcylindrical handle 29 is internally screwthreaded, and into it isscrewed the screwthreaded end of nose or nozzle 34, which latter isbored throughout its length, which bore or perforation is occupied bythe reciprocating tool carrier 35, which is provided with ascrew-threaded socket 36 within which is screwed the tool 37. Nose 34 isprovided with a milled surface to enable it to be easily turned onto thehandle.

The tool carrier 35 is provided at its upper end with an elongated eyeor opening 3S through which and the screw-threaded end of nose 34 passesa screw 39. This elongated opening in the tool carrier permits a shortreciprocating motion to the latter, when it is operated by meanspresently to be described. The bore of the nose is enlarged at its upperend, to provide a shoulder 40, between which latter and an enlargementl1 below the eye IOO of the tool carrier is situated a spiral spring 42,which forces the tool carrier back for engagement of the hammer 43therewith, the end of the tool carrier projecting up from the screwthreaded portion of the nose 34 to permit the engagement. l

Hammer 43 is a solid cylinder which is alternately forced forward andbackward within the cylindrical handle by the alternate compression andrarefication of the air behind it. Situated between the hammer and theplug 30 is a spiral spring44, whereby the forward motion of the hammeris assisted, it imparting to the same with increased energy a rapidmovement whereby a rapid elastic blow is transmitted to the tool carrier35 and hence to the tool 37. v

The handle is provided with a vent or valve 45 between .the nose and thehammer for the escape of air. This vent may be closed entirely or thesize of the opening may be regulated by means of a milled face ring 46fitted loosely on the handle. If it is desired that the tool carried begiven a light blow, this Vent should be closed when the air confinedwill act asa cushion against the hammer.

When the heaviest blow is required the vent should be entirely open. Allparts of my device, excepting of course, the flexible tubing, arepreferably constructed of metal.

Having thus described my invention, the following is what I claim as newtherein and desire to secure by Letters Patent:

l. The means for varying the speed of the tool of a dental pluggeroperated by an air pump, consisting of an eccentrically perfo ratedwheel, the piston, and the connect-ing rod, substantially as set forth.

2. In combination with the piston of an air pump of a dental plugger,the operating wheel carrying a rod, and a metallic' spring plate,connected with said rod, and the piston as and for the purpose setforth.

3. Ina pneumatic dental plugger, the hollow handle provided with a Vent,and a ring fitted loosely on the handle for regulating the vent opening,substantially as set forth.

JOHN H. HEIVLY.

Witnesses:

OcTAvIUs KNIGHT, HERVEY S. KNIGHT.

